Waterboy,
Groan!!! Yes, Twombly wrote that bit in AOPA some time ago, and I specifically wrote to him and Tom Haines, the Editor in Chief, illustrating that that information was specifically wrong.
Contrary to your statement, in at least this case, FAR 91.9 is quite clear: If an Airplane Flight Manual (AFM) is required, it must be on board the airplane for the airplane to be considered airworthy. Same goes for required placards.
Soooo, where does one find THAT information (the required placards/flight manual)? The answer is the Type Certificate Data Sheet for your aircraft. These can be found at:
http://rgl.faa.gov/Regulatory_and_Guida ... enFrameSetOnce you find the TCDS for your airplane, you need to scroll down to the list of requirements for all aircraft. Here's that data for the Cessna 170:
Interior Equipment
401. Cabin heater valve assembly 1 lb. (-2) (-2) (-2)
402.
(a) CAA Approved Airplane Flight Manual and pertinent revisions applicable to the particular model, serial number, and landing gear installationThat section goes on to list a whole bunch of AFM supplements that are required for specific installed equipment.
Here's a link to the 170 TCDS:
http://rgl.faa.gov/Regulatory_and_Guida ... enDocumentAnd, you will note that the "Owners manual" is NOT on the list of required equipment. It need not be aboard the airplane...ever.
If I were you, I'd find that four page AFM for your airplane, or order a new one from Cessna parts. And, you might want to chat with your mechanic....if he/she hasn't located that and verified that it's in the airplane, then his/her signoffs of annual inspections are not correct.
FWIW. Believe erroneous information posted by AOPA, or read the TYPE CERTIFICATE REQUIREMENTS for your own airplane.
And, frankly, MOST pre 1979 airplanes did have an AFM. THe 1979 date was when the General Aviation Manufacturers Association realized that the FAA was about to dictate to them some "standardized" presentation of AFM data, so GAMA got it's members to all agree to a "standard" format Pilot Operating Handbook, which would ALWAYS contain the required AFM data. A good idea, indeed, since it generally precludes the kind of mis information that Twombly wrote.
MTV